"Narrow streets, some in "Belgian block", and don't forget the streetcar tracks..."
Fort Worth has some historically preserved brick streets and some small patches of brick between paved roads. Lots of railroad tracks crossing streets, although they've sorta paved across some discontinued tracks. Even the MUP in the city parks have some tricky miniature RR track crossings, often at angles to approach.
While I see some folks riding road bikes with super skinny tires, I'm more comfortable with wider tires. Helps when negotiating bricks, ruts and other wheel-grabbers at odd angles. Sometimes those things sneak up on us and we may not have the option to approach at a perpendicular.